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[libvirt] [PATCH v3 2/4] libxl: vnuma support



From: Wim ten Have <wim ten have oracle com>

This patch generates a NUMA distance-aware libxl description from the
information extracted from a NUMA distance-aware libvirt XML file.

By default, if no NUMA node distance information is supplied in the
libvirt XML file, this patch uses the distances 10 for local and 21 for
remote nodes/sockets."

Signed-off-by: Wim ten Have <wim ten have oracle com>
---
Changes on v1:
- Fix function calling (coding) standards.
- Use virReportError(...) under all failing circumstances.
- Reduce redundant (format->parse) code sorting bitmaps.
- Avoid non GNU shorthand notations, difficult code practise.
Changes on v2:
- Have autonomous defaults applied from virDomainNumaGetNodeDistance.
- Automatically make Xen driver simulate vnuma pnodes on non NUMA h/w.
- Compute 'memory unit=' making it the sum of all node memory.
---
 src/libxl/libxl_conf.c   | 120 +++++++++++++++++++++++++++++++++++++++++++++++
 src/libxl/libxl_driver.c |   3 +-
 2 files changed, 122 insertions(+), 1 deletion(-)

diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 4416a09..5fb3561 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -618,6 +618,121 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
     return 0;
 }
 
+#ifdef LIBXL_HAVE_VNUMA
+static int
+libxlMakeVnumaList(virDomainDefPtr def,
+                   libxl_ctx *ctx,
+                   libxl_domain_config *d_config)
+{
+    int ret = -1;
+    size_t i, j;
+    size_t nr_nodes;
+    size_t num_vnuma;
+    bool simulate = false;
+    virBitmapPtr bitmap = NULL;
+    virDomainNumaPtr numa = def->numa;
+    libxl_domain_build_info *b_info = &d_config->b_info;
+    libxl_physinfo physinfo;
+    libxl_vnode_info *vnuma_nodes = NULL;
+
+    if (!numa)
+        return 0;
+
+    num_vnuma = virDomainNumaGetNodeCount(numa);
+    if (!num_vnuma)
+        return 0;
+
+    libxl_physinfo_init(&physinfo);
+    if (libxl_get_physinfo(ctx, &physinfo) < 0) {
+        libxl_physinfo_dispose(&physinfo);
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("libxl_get_physinfo_info failed"));
+        return -1;
+    }
+    nr_nodes = physinfo.nr_nodes;
+    libxl_physinfo_dispose(&physinfo);
+
+    if (num_vnuma > nr_nodes) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("Number of configured numa cells %zu exceeds the physical available nodes %zu, guest simulates numa"),
+                       num_vnuma, nr_nodes);
+        simulate = true;
+    }
+
+    /*
+     * allocate the vnuma_nodes for assignment under b_info.
+     */
+    if (VIR_ALLOC_N(vnuma_nodes, num_vnuma) < 0)
+        return -1;
+
+    /*
+     * parse the vnuma vnodes data.
+     */
+    for (i = 0; i < num_vnuma; i++) {
+        int cpu;
+        libxl_bitmap vcpu_bitmap;
+        libxl_vnode_info *p = &vnuma_nodes[i];
+
+        libxl_vnode_info_init(p);
+
+        /* pnode */
+        p->pnode = simulate ? 0 : i;
+
+        /* memory size */
+        p->memkb = virDomainNumaGetNodeMemorySize(numa, i);
+
+        /* vcpus */
+        bitmap = virDomainNumaGetNodeCpumask(numa, i);
+        if (bitmap == NULL) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("vnuma sibling %zu missing vcpus set"), i);
+            goto cleanup;
+        }
+
+        if ((cpu = virBitmapNextSetBit(bitmap, -1)) < 0)
+            goto cleanup;
+
+        libxl_bitmap_init(&vcpu_bitmap);
+        if (libxl_cpu_bitmap_alloc(ctx, &vcpu_bitmap, b_info->max_vcpus)) {
+            virReportOOMError();
+            goto cleanup;
+        }
+
+        do {
+            libxl_bitmap_set(&vcpu_bitmap, cpu);
+        } while ((cpu = virBitmapNextSetBit(bitmap, cpu)) >= 0);
+
+        libxl_bitmap_copy_alloc(ctx, &p->vcpus, &vcpu_bitmap);
+        libxl_bitmap_dispose(&vcpu_bitmap);
+
+        /* vdistances */
+        if (VIR_ALLOC_N(p->distances, num_vnuma) < 0)
+            goto cleanup;
+        p->num_distances = num_vnuma;
+
+        for (j = 0; j < num_vnuma; j++)
+            p->distances[j] = virDomainNumaGetNodeDistance(numa, i, j);
+    }
+
+    b_info->vnuma_nodes = vnuma_nodes;
+    b_info->num_vnuma_nodes = num_vnuma;
+
+    ret = 0;
+
+ cleanup:
+    if (ret) {
+        for (i = 0; i < num_vnuma; i++) {
+            libxl_vnode_info *p = &vnuma_nodes[i];
+
+            VIR_FREE(p->distances);
+        }
+        VIR_FREE(vnuma_nodes);
+    }
+
+    return ret;
+}
+#endif
+
 static int
 libxlDiskSetDiscard(libxl_device_disk *x_disk, int discard)
 {
@@ -2208,6 +2323,11 @@ libxlBuildDomainConfig(virPortAllocatorPtr graphicsports,
     if (libxlMakeDomBuildInfo(def, ctx, caps, d_config) < 0)
         return -1;
 
+#ifdef LIBXL_HAVE_VNUMA
+    if (libxlMakeVnumaList(def, ctx, d_config) < 0)
+        return -1;
+#endif
+
     if (libxlMakeDiskList(def, d_config) < 0)
         return -1;
 
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 8fefce6..a7d8bfe 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -2788,7 +2788,8 @@ libxlDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flag
     virCheckFlags(VIR_DOMAIN_DEFINE_VALIDATE, NULL);
 
     if (flags & VIR_DOMAIN_DEFINE_VALIDATE)
-        parse_flags |= VIR_DOMAIN_DEF_PARSE_VALIDATE_SCHEMA;
+        parse_flags |= (VIR_DOMAIN_DEF_PARSE_VALIDATE_SCHEMA |
+                        VIR_DOMAIN_DEF_PARSE_ABI_UPDATE);
 
     if (!(def = virDomainDefParseString(xml, cfg->caps, driver->xmlopt,
                                         NULL, parse_flags)))
-- 
2.9.5


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